Question

ABCD is a parallelogram. if angleA =(2x-30)° and angleD=(2x+10)°. find angle B​

Answer 1

Answer:

2x-30 + 2x+10 = 180

4x = 180 + 30 -10

4x = 200

x = 50

In a parallelogram ABCD,

Angle B = Angle D

Angle B = 2x + 10

= 2*50 - 10

= 90

Answer 2

Step-by-step explanation:

since adjacent angles of a parallelogram are supplementary.

2x -30 + 2x +10 = 180

4x -20 = 180

4x = 200

x = 200/4

x = 50

Now angle D = angle B becoz opposite angles are equal

angle B = 110 degree